Sound waves worksheet for Grade 4 students, featuring a labeled wave diagram and questions on amplitude and wavelength.

Absolutely! Let’s solve this Sound Waves – Grade 4 worksheet step by step.

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## 🌊 PART 1: Label the Wave

You are given a diagram of a wave with letters A–F pointing to different parts. You need to label each part using these terms:

> Amplitude – Wavelength – Trough – Crest

Let’s identify each part:

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🔹 A → Crest

- The crest is the highest point of a wave.
- Letter A points to the top of the wave — that’s the crest.

✔ A: Crest

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🔹 B → Wavelength

- Wavelength is the distance between two consecutive crests (or two troughs).
- B shows the horizontal distance from one crest to the next crest — perfect!

✔ B: Wavelength

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🔹 C → Amplitude

- Amplitude is the height of the wave from the rest position (middle line) to the crest (or trough).
- C shows the vertical distance from the middle line up to the crest — that’s amplitude.

✔ C: Amplitude

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🔹 D → Trough

- The trough is the lowest point of a wave.
- D points to the bottom of the wave — that’s the trough.

✔ D: Trough

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🔹 E → Wavelength

- Again, wavelength can also be measured from trough to trough.
- E shows the horizontal distance from one trough to the next trough — still wavelength.

✔ E: Wavelength

*(Note: Sometimes worksheets show wavelength from crest to crest OR trough to trough — both are correct.)*

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🔹 F → Amplitude

- F shows the vertical distance from the middle line down to the trough.
- Since amplitude measures the maximum displacement from the rest position, it’s the same whether you measure to the crest or the trough.

✔ F: Amplitude

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## ✔ Final Answers for Part 1:

> A: Crest
> B: Wavelength
> C: Amplitude
> D: Trough
> E: Wavelength
> F: Amplitude

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## 📈 PART 2: Comparing Amplitudes of Two Waves

You’re shown Wave 1 and Wave 2, and asked:

> 1. Which wave has the highest amplitude?
> 2. Which wave has the lowest amplitude?

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💡 What is Amplitude?

Amplitude = how tall or “big” the wave is from the middle (rest) line to its highest or lowest point.

- Larger amplitude = louder sound (in sound waves)
- Smaller amplitude = quieter sound

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👀 Looking at the Waves:

- Wave 1: The dots go only a little bit above and below the dashed center line. Very small up-and-down movement.
- Wave 2: The dots go much higher above and lower below the center line. Big up-and-down movement.

→ So, Wave 2 has a larger amplitude than Wave 1.

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## ✔ Final Answers for Part 2:

> 1. Which wave has the highest amplitude? → Wave 2
> 2. Which wave has the lowest amplitude? → Wave 1

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## 🎯 Summary:

Part 1 – Labeling:

- A: Crest
- B: Wavelength
- C: Amplitude
- D: Trough
- E: Wavelength
- F: Amplitude

Part 2 – Amplitude Comparison:

- Highest amplitude: Wave 2
- Lowest amplitude: Wave 1

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✔ You’ve now completed the worksheet correctly! Great job understanding the parts of a wave and how amplitude affects sound! 🎵